今天就跟大家聊聊有關java項目中使用Cors實現(xiàn)后端跨域的法，可能很多人都不太了解，為了讓大家更加了解，小編給大家總結了以下內容，希望大家根據(jù)這篇文章可以有所收獲。
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代碼如下：
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重慶分公司
package com.lvluo.web.filter.CorsFilter;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.http.HttpHeaders;
public class CorsFilter implements Filter {
public static final String ACCESS_CONTROL_REQUEST_METHOD = "Access-Control-Request-Method";
public static final String OPTIONS = "OPTIONS";
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest httpRequest = (HttpServletRequest) request;
HttpServletResponse httpResponse = (HttpServletResponse) response;
if (isCorsRequest(httpRequest)) {
httpResponse.setHeader("Access-Control-Allow-Origin", "*");
httpResponse.setHeader("Access-Control-Allow-Methods",
"POST, GET, PUT, DELETE");
httpResponse.setHeader("Access-Control-Allow-Credentials", "true");
// response.setIntHeader("Access-Control-Max-Age", 1728000);
httpResponse
.setHeader(
"Access-Control-Allow-Headers",
"Origin, X-Requested-With, Content-Type, Accept, Accept-Encoding, Authorization");
if (isPreFlightRequest(httpRequest)) {
return;
}
}
chain.doFilter(request, response);
}
public void init(FilterConfig filterConfig) {
}
public void destroy() {
}
public boolean isCorsRequest(HttpServletRequest request) {
return (request.getHeader(HttpHeaders.ORIGIN) != null);
}
/**
* Returns {@code true} if the request is a valid CORS pre-flight one.
*/
public boolean isPreFlightRequest(HttpServletRequest request) {
return (isCorsRequest(request) && OPTIONS.equals(request.getMethod()) && request
.getHeader(ACCESS_CONTROL_REQUEST_METHOD) != null);
}
}接著在web.xml配置filter即可
corsFilter com.lvluo.web.filter.CorsFilter corsFilter /api/*
前端測試的JS代碼，其中客戶端的
$.ajax({
headers : {
'Authorization' :'Bearer iBoxSO9QdrHR0'
},
url: 'http://localhost:8080/service/api/ping',
type: 'GET',
dataType: 'json',
success : function(result){
$("#result").html(result.code);
}
})看完上述內容，你們對java項目中使用Cors實現(xiàn)后端跨域的法有進一步的了解嗎？如果還想了解更多知識或者相關內容，請關注創(chuàng)新互聯(lián)行業(yè)資訊頻道，感謝大家的支持。
